In analogy with the analysis of [1]}, using the equation of motion obtained by varying () with respect to \(y_{\alpha (2s-4)}\) , it follows that we may impose the gauge
\(y_{\alpha (2s-4)}=0~,\qquad \mathcal {D}^{\beta (2)}h_{\beta (2)\alpha (2s-2)}=0~. \) 
